A Simple example with a ListBox

In this Article i am going to explain you how to transfer a Item from one ListBox to another ListBox.Here i taken two ListBoxes,I added one Some Items in first ListBox.When the user select a Item from first ListBox it has to show in another listBox.

Below Image shows how to Add Items in a ListBox

After Adding Click Ok.Add Some Buttons for select,Remove,Select all,remove all.Then your Listbox as shows as in below image

Here Select Button is used to Select a user Only one Item.Remove Button is used to remove onely one Item from second listbox.SelectAll Button is used to send all items from first listbox to second ListBox.RemoveAll Button is used to remove all selected Items from Second ListBox.

Use the Below code in Select Butteon to send a SelectedItem from first ListBox to Second ListBox

protectedvoid Select_Click1(object sender, EventArgs e)

{

ListItem li = newListItem();

li.Text = selecteditem;

li.Value = selecteditem;

ListBox2.Items.Add(li);

}

if the user dont want to allow repeted Items in second ListBox then use below code

protectedvoid Select_Click1(object sender, EventArgs e)

{

boolflag = false;

string selecteditem = ListBox1.SelectedItem.Text;

if (ListBox2.Items.Count >= 1)

{

for (int i = 0; i < ListBox2.Items.Count; i++)

{

if (selecteditem == ListBox2.Items[i].Text)

{

Response.Write("Already Item Selected");

flag =true;

}

}

if (flag == false)

{

ListItem li = newListItem();

li.Text = selecteditem;

li.Value = selecteditem;

ListBox2.Items.Add(li);

}

}

else

{

ListItem li = newListItem();

li.Text = selecteditem;

li.Value = selecteditem;

ListBox2.Items.Add(li);

}

}

The output as Shows Below after selecting one item

When user wants to remove selected Item From Second ListBox use the Below code in Remove Button.It removes only one selected Item

protectedvoid Remove_Click(object sender, EventArgs e)

{

try

{

if (ListBox2.Items.Count >= 1)

{

if (ListBox2.SelectedValue != null)

{

string selecteditem2 = ListBox2.SelectedItem.Text;

ListBox2.Items.Remove(selecteditem2);

}

}

else

{

Response.Write("No ITEMS Found");

}

}

catch ( Exception e1)

{

}

}

write Below code in SelectAll button when user wants to select all Items at a Time and transer to second ListBox.

protectedvoid SelectAll_Click(object sender, EventArgs e)

{

ListBox2.Items.Clear();

for (int i = 0; i < ListBox1.Items.Count; i++)

{

ListItem li = newListItem();

li.Text = ListBox1.Items[i].Text;

li.Value = ListBox1.Items[i].Value;

ListBox2.Items.Add(li);

}

}

The outPut of SelectAll will displays a Below:

When the user wants to DeSelect (or) Remove all Items from second ListBox write the below code in RemoveAll Button: